Gas-motor.



f no. 634,063. Patented uct. .3, 1899..' c. .1. r.`Mu.1.LET-`F0MTA|NE a L. A. c.,LETomsE.

` GAS MUTUR.

(Appliut on Bled Nov. 15, 1897.)

(lo Modul.) 4 Sheets-Shed L Z'TL Herbiers.' I

Wlzvnrg. n la j@ No. 63.64163.v A Patented ont. 3, |899..

c. F. noLLET-Fnumns- Lz A. c. L E'roMBE.

`GAS ITUR.

- (Application mnd Nov. 15, -18911.) (No Model.) 4 Sheets-'Sheet 2 m'xwfw.

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No. 634,063 I Patented Det. 3f, |899. C. J, F. M DLLET-IFUNTAIHE'G, L. A. C.y LETMBE.

GAS MUTOR.

4 (Appuwion med xav. '15, um.) (No'lludel.) v 4 Sheoiaf-She'et.

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No. 634,053.l A n Patented om. 3, |399. c. .L F. n'oLLE-T-Foumnz a L'. A. c. LEToMBE.

GAS IDTOR.

' (Application illd Nav. 15, 1897.) (lo Indel.) .4 Sheets-Sheet-Al.

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UNIT-ED STATES PATENT OFFICE.

CHARLES JOSEPH FIRMIN MOLLET-FNTAINE AND LEON ABEL'GELER LETOMBE, OF LILLE, FRANCE.

I eAs-MolToR.

SPECIFICATION forming part of LettersiPatent No. 634,063, dated October 3, 1 899. Application iile November 15, 1897.' Serial No. 658.612. (No model.)

T0 ctZ Lai/1,0m, it' wwf/y oon/cern:

Be it known that we, CHARLES JOSEPH FIE- MIN MoLLET-FONTAINE and LEON ABEL OE- LEE LETOMBE, citizens of the'Republic of France, residing kat Lille, France, have invented Improvements in Gas-Motors,of whichV the following is aspeciiication.`

The invention hereinafter described is applicable to all kinds of motors capable of acting under the control of a regulator'with variableV charges of an explosive mixture, the volumev of which is consequently independentof the space rendered vacant by the piston in its stroke. In this classof motor,the consumption,

Now these two metl1ods,which are very suit-4 able for avoiding abrupt changes in the speed which are metin the method of controlof the ordinary gas-motors, unfortunately diminish the thermic yield in a great measu re-the first methodin consequence of thediminution of compression insufficiently compensated by the increase of the'period of expansion, and

the secondmethodin consequence of deforma-v tions of the cycle resulting from the imper- 'fect ignition which occurs when the composition of the explosive vmixture is no longer in harmonywith the compression requisite in the machine.

The vimprovements in question have for their object to secure a new method of regulation of gas-engines by means of variable charges .Without diminution of the thermic yield for the indicated work. This'method consists essentially in reducing the force of the charges admitted when the resistance to be encountered tends to become reduced b elow its maximum 4by a supercompression caused by the augmentation of the volume of explosive mixture admitted combined with the simultaneous reduction of the percentage of gas in the said mixture in proportion as the said admissions are increased.

In the draWings,.Figure l is andiagram-'ntended to facilitate the comprehension of our invention. Fig. 2 is a front elevation of the cylinder` of a double-acting gas-engine constructed according to our invention. Fig. 3 shows La plan view of the same cylinder. Fig. 4 is a section'on the line my of Fig. 2. Figs. 5, 6, 7, and S show details of the controlling mechanism.

Referring rst to the diagram shown in Fig. 1,\vhich illustrates the full charge of a machine having admission' of gas independent of the stroke, the actionvvill be', no matter-What the system employed, as if there Were admission from a to b, depressure, for instance, from' b tofduring the latter portion of the suctionstroke, compression from fto h during the iirst portion of the compression-stroke, effective compression from b to c, explosion and expansion from c to d and thence to c, and escape from e to a. If it is desired to obtain a diagram of less area and toeffect regulation in conformity with our invention, the admission instead of being diminished will be increased up to a point Z9 between b and e,'and the pressure drops, for inst-ance, from b' tof during the latter portion of the suctionstroke and reaches again b'. At b" beg-ins the effective compression, which, owing to the increasedadmission a b', causes a supercompression at c', but at the same time We diminish the quantity of gas in the mixture so that .the explosion can neverexceed the point d, which is a maximum which has been settled previously. For this purpose it is requisite that the volumes of gas admitted during the aspirations d b and co b should be-proportioned as the perpendiculars c d and c d. Obviously the surface b' c' d c is less than the surface 13 c d e. At the limit when the motor becomes partly unloaded the admission might be allowed to continue throughout the entire stroke, the proportion of gas being suitably diminished or even suppressed altogether if calculations Will show that the thermic yield of the cycle under consideration increases in proportion as-the surface diminishes, as We have indicated above. The supercompression, such as c c', in excess of the normal compressions a c cannot cause any disturbance, because the pressure ofthe explosion can reduced successively in such manner as is the machine were too much unloaded. Now` IOO never exceed a iixed quantity if the gas be above specified. 3y making use of these means the content in gas of the mixture diminishes consequently in proportions as the admissions increase; but as the compression increases at the same time the ignition remains effective.

AS already stated, Figs. 2 to 8 of the drawings show arrangements devised to admit of the application of this method of control to a double-acting*gas-engine having a cycle of four strokes. Each end of the cylinder L, Figs. 2, 3, and 4, bears a chamber containing two valves, Fig. 5, one marked A, which communicates With the cylinder L by the port t', Fig. 4, and the other marked B,Which communicates With the irst by means of the intermediate chamber C, as shown in Fig. 5, which gives a section on the line ,e t of Fig. 3. This valve B closes in the opposite direction, so as automatically to shut off all communication with the outside Whenever a depression tends to be formed in the cylinder L. The two valves A and B can, moreover, as shown in Fig. 5, open in the same direction. The valve B, which can open a little in advance of the valve A, meets on opening with the valve G, which it also raises and which gives access to the gas at m, as shown at Fig. 6, which figure shows a section of these valves on the line to QJ of Fig. 3. The air is supplied through n, Fig. 5- When the working is regulated by supercompression, the valve B when the rcsisting load diminishes closes later and later and the gas-valve G, on the contrary, sooner and sooner. At the limitwhen the machine is finally unloaded the valve B no longer rises sufficiently to actuate the valve G,and a void stroke is produced.

The valves B are actuated by the levers K, Figs. 2 and 4, having rollers J, Fig. 4, which receive their motion from stepped cams P, mounted upon the shaft O, Figs. 2 and 4, actuated directly by the main shaft of the motor.

these stepped cams P. The rollers J, which rest against these cams, can be displaced f transversely by the regulating mechanism, (denoted generally by R,) so as to encounter, as will be shown hereinafter,respectively, the

Figs. 7 and 8 show separately one'of one or the other superposition of the cams I. This operation is effected by means of the articulated parallelogram S TU Vand of the clips provided With springs R, which prevent said clips gripping the rollers, Figs. 2 and 4. The duration of the full aspiration corresponds to the angle ly O z', Fig. 7. The superposed successive steps of the cams P are shown as shaped at 4 l 2 2 or 4 l 3 3', tbc., in which 4 l corresponds to the advance and l 2 or l 3, and so on, to the superposition for the admission of the gas. The empty stroke cor responds to 4 4 without superposition. These arrangements, the use of which is very advantageous for a double-acting motor, are obviously also applicable to single-action motors.

Having thus described our invention, we claiml. In combination in a gas-engine With the cylinder and piston, a gas-valve and an airvalve, With controlling means for said valves arranged substantially a-s described upon reduction of the. load of the engine to increase the supply of air While reducing that of the gas, substantially as described.

2. In combination, the cylinder, the airvalve B, the gas-valve arranged to be operated thereby and to close sooner than the airvalve With means for controlling the operation of the air-valve B to increase the supply of air while reducing that of the gas upon the reduction of the load of the engine, substantially as described.

3. In combination, the cylinder, the gasvalve, the air-valve arranged to operate the gas-Valve and a lever, and graduated cam for operating the air-valve with governor mechanism controlling the valve to increase the supply of air While reducing that of the gas upon the reduction of the load of the engine, substantially as described.

In Witness whereof We have hereunto set our hands in presence of tWo Witnesses.

Witnesses:

BorHIAT EUGENE, ALEXrs BEsIN. 

